单项选择题

Doing exercise regularly is a sure way to improve health, and this is especially important ______it comes to the youth.

A. before
B. when
C. as
D. since
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单项选择题
She is not______with all her roommates, yet she has nowhere else to live.
A. considerate
B. complimentary
C. compatible
D. concerned
单项选择题
This painting is said to be______, accomplished by a famous painter in Song Dynasty.
A. worthless
B. priceless
C. valueless
D. worth
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